I would say about 20% of the books I've bought are not free. There is a lot of good free content that I have found since getting my K1. Quite a few of the books I've bought were to continue reading a series. For me to buy something else, it would be something I really felt the need to read right away.
One of my favorite books I got for free was "The Assassin's Apprentice" by Robin Hobb. After thoroughly enjoying that book, I purchased the rest of the Farseer trilogy, the Liveship Traders series, and the Tawny Man series. That one free book ended up with me purchasing eight more books from that author. I might not have ever looked at any of those books without finding the first one for free.
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I did the same thing and I would never have read those books otherwise.
the most I have spent on a kindle book is about $160.00 but it was a textbook, I spent 80 the other day for another textbook. I prefer to stay in the under $10 range for fiction, and I usually hold off on the $9.99 books unless it is part of a series I am desperate to read. Lately I have been using overdrive for kindle books. That being said, most of my family shares my account and they are not as cheap/frugal as I am so at least $100 worth of books per month end up getting purchased.